Move organisations_name_list into admin

It is only used by admin views. It should live with admin views.
Use name list for organisations rather than logos

On document pages use a list of names for the organisations rather than
the logos. Updated the hide-other-links to let it show all the lead
organisations before it hides the rest of the organistions.

Updated a couple of tests to work with the new format.
Merge pull request #465 from alphagov/org-logo-list

Remove the organisation logos from documents

https://www.pivotaltracker.com/story/show/44861455